package com.my.screenadapter.utils;

import android.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * Created by 张英杰 on 2017/5/11.
 */

public class PassWordUtil {

    /*已确认
    * 加密用的Key 可以用26个字母和数字组成
    * 此处使用AES-128-CBC加密模式，key需要为16位。
    */
    private static String sKey="zysoftware123456";
    private static String ivParameter="L+\\~f4,Ir)b$=pkf";

    public static String myEncrypt(String content){
        try {
           return encrypt(content,"utf-8",sKey,ivParameter);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    // 加密
    public static String encrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
//        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
        StringBuffer sb=new StringBuffer();
        for (int i = 0; i < encrypted.length; i++) {
            sb.append(encrypted[i]);
        }
        return encodeBase64(encrypted);//此处使用BASE64做转码。
    }

    // 解密
    public static String decrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
//            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] encrypted1 = decodeBase64(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,encodingFormat);
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }


    /***
     * encode by Base64
     */
    public static String encodeBase64(byte[]input){
       return Base64.encodeToString(input, Base64.DEFAULT);
    }
    /***
     * decode by Base64
     */
    public static byte[] decodeBase64(String input) throws Exception{
       return Base64.decode(input, Base64.DEFAULT);
    }
}
